Stair Rise Calc
Answer One flight, cut as a single stringer.

5-step stair stringer

Total rise it covers 20into38in
Risers
5
Typical total rise
35in35.000 in2 ft 11 in
Board length
6ft
The stringer board as it lies for marking, with 5 notches cut along its top edge from a 6-foot board. One notch is dimensioned 7.000 inches on the rise and 11.00 inches on the run, the waste is hatched, and the bottom cut is dropped 1.00 inches. Rise mark7 in Run mark11 in Bottom cut1 in Board6 ft
Range

Every total rise this stringer covers

Pick your own total rise. Every row is cut with the same number of risers.
Total rise Riser Tread Total run Stringer Marked Board Result
20in 4in 14in 56in 597/16in 7213/16in 7ft Within
21in 43/16in 14in 56in 5913/16in 731/16in 7ft Within
22in 43/8in 14in 56in 603/16in 733/8in 7ft Within
23in 45/8in 14in 56in 609/16in 7311/16in 7ft Within
24in 413/16in 14in 56in 6015/16in 74in 7ft Within
25in 5in 14in 56in 615/16in 745/16in 7ft Within
26in 53/16in 14in 56in 613/4in 7411/16in 7ft Within
27in 53/8in 14in 56in 623/16in 75in 7ft Within
28in 55/8in 1313/16in 553/16in 617/8in 747/16in 7ft Within
29in 513/16in 133/8in 535/8in 6015/16in 73in 7ft Within
30in 6in 13in 52in 601/16in 719/16in 7ft Within
31in 63/16in 125/8in 503/8in 593/16in 703/16in 7ft Within
32in 63/8in 123/16in 4813/16in 583/8in 687/8in 7ft Within
33in 65/8in 1113/16in 473/16in 579/16in 675/8in 7ft Within
34in 613/16in 113/8in 455/8in 567/8in 663/8in 7ft Within
35in 7in 11in 44in 561/4in 653/16in 6ft Within
36in 73/16in 105/8in 423/8in 555/8in 641/16in 6ft Within
37in 73/8in 103/16in 4013/16in 551/16in 63in 6ft Within
38in 75/8in 10in 40in 553/16in 6213/16in 6ft Within
Solution

Every dimension of this flight

Worked at a total rise of 35.00 inches.
DimensionValue
Typical total rise 35in35.00 in2 ft 11 in
Risers 5
Riser height 7in7.000 in
Treads 4
Tread run 11in11.000 in
Total run 44in44.000 in3 ft 8 in
One step along the edge 131/16in13.038 in
Marked length 653/16in65.192 in5 ft 5.19 in
Stringer length 561/4in56.223 in4 ft 8.22 in
Board length 6ft
Angle 32.5°
Bottom cut deduction 1in1.000 in
Cut list

The marks, bottom to top

Measured along the edge of the board from the foot, after the bottom cut.
Marked length
653/16in65.192 in5 ft 5.19 in
Bottom cut deduction
1in
  1. 7in×11in 131/16inFrom the foot
  2. 7in×11in 261/16inFrom the foot
  3. 7in×11in 391/8inFrom the foot
  4. 7in×11in 521/8inFrom the foot
  5. 7in×11in 653/16inFrom the foot
Code

Each figure against the limit it has to meet

Dimension Limit Code Result
Riser height, maximum 73/4in IRC 2021 (residential) Within
Tread depth, minimum 10in IRC 2021 (residential) Within
Stair width, minimum 36in IRC 2021 (residential) Within
Riser height, minimum 4in ADA 2010504.2 Within
Riser height, maximum 7in ADA 2010504.2 Within
Tread depth, minimum 11in ADA 2010504.2 Within
Nosing projection, maximum 11/2in ADA 2010504.5 Within
Asked about this

Questions people search for

How high will a 5-step stringer go?
A 5-step stringer covers 20 to 38 inches of total rise, floor to floor. Below that the risers fall under the 4 inch minimum; above it they pass 7 3/4 inches.
How long a board do you need for a 5-step stringer?
At a 35 inch total rise the marks run 65.192 inches along the edge of the board, so the shortest board that takes them with the top and bottom cuts is 6 feet.
How do you lay out a 5-step stringer?
Set a framing square to 7.000 inches on the tongue and 11.00 inches on the blade and step it 5 times along the board, then drop the bottom cut by one tread thickness. Every mark is listed on this page, and the stringer layout page shows where each one goes.
Next door

Other step counts

Source

Where the limits come from

2 sources, with the date each was read

Building codes are adopted and amended locally. Confirm every figure with the code your jurisdiction has adopted before you cut.

Updated September 2026